Comparison simulation test device and method for geothermal fluid anti-scaling method

Abstract

The invention relates to the technical field of geothermal fluid anti-scaling detection, in particular to a comparison simulation test device and method for a geothermal fluid anti-scaling method, and the device comprises a power unit which is arranged in a box body. And the flow dividing unit is connected with the power unit and divides the geothermal fluid conveyed by the power unit to a first pipeline and a second pipeline. The scaling unit comprises a first scaling assembly and a second scaling assembly, geothermal fluid in the box body is pumped out through the power unit and conveyed into the first pipeline and the second pipeline, and the geothermal fluid in the first pipeline directly passes through the first scaling assembly; fluid in the second pipeline is treated by the to-be-tested test scale inhibition device and then passes through the second scaling assembly, and after running for a period of time, the scaling amount of the first scaling assembly on the first pipeline without the to-be-tested test scale inhibition device and the scaling amount of the second scaling assembly on the second pipeline with the to-be-tested test scale inhibition device are compared; and the scale inhibition performance of the to-be-tested scale inhibition device can be judged.

Description

Technical Field

[0001] This invention relates to the field of geothermal fluid scale prevention and detection technology, and in particular to a comparative simulation test device and method for geothermal fluid scale prevention. Background Technology

[0002] Medium-deep geothermal energy, as a renewable green energy source, is extracted and utilized from groundwater. It is an effective way to conserve energy, reduce emissions, and protect the environment, and has therefore received widespread attention, being extensively applied in geothermal heating, aquaculture, and health and wellness projects. How to develop and utilize geothermal energy under the principle of protection, and achieve sustainable development, is a real problem facing geothermal mineral management and users.

[0003] Because geothermal fluids are stored underground and have been integrated with ancient geological rocks and soils from different periods, the geothermal fluids extracted to the surface are rich in various minerals, and some fluids have a high degree of mineralization. During the utilization of geothermal fluids, some fluids are prone to forming scale, which deposits on the surface of equipment flow parts, causing problems for geothermal engineering applications.

[0004] Geothermal management requires a balance between extraction and irrigation, raw water reinjection, and pollution prevention as its protective objectives. Geothermal fluids retain heat through heat exchangers, and the reinjection of raw water in a closed system without altering its properties is a concrete implementation of this protective principle. Therefore, people continuously emphasize and research various physical methods for scale prevention and inhibition to improve the technological level of development and utilization.

[0005] Based on this, there is an urgent need for a comparative simulation test device for geothermal fluid scale prevention methods to identify various scale inhibition methods and devices, continuously improve the scale inhibition effect, and provide testing services for manufacturers to find the performance parameters of the best ratio data.

[0006] Therefore, a comparative simulation test device and method for preventing scale buildup in geothermal fluids are proposed. Summary of the Invention

[0007] In this section, as well as in the abstract and title of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract, and the title of this application, and such simplifications or omissions shall not be used to limit the scope of the invention.

[0008] Given the urgent need in the existing technology for a comparative simulation test device for geothermal fluid scale prevention methods, to identify various scale prevention methods and devices, to continuously improve scale prevention effects, and to provide testing services for manufacturers to find the performance parameters of the best ratio data, one objective of this invention is to provide a comparative simulation test device for geothermal fluid scale prevention methods.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a comparative simulation test device for geothermal fluid anti-scaling methods, comprising: a power unit disposed inside a housing; a diversion unit connected to the power unit, which diverts the geothermal fluid transported by the power unit to a first pipe and a second pipe; and a scaling unit comprising a first scaling component and a second scaling component, wherein the first scaling component is connected to the first pipe, and the second scaling component is connected to the second pipe through a scale inhibition device to be tested.

[0010] As a preferred embodiment of the comparative simulation test device for the geothermal fluid anti-scaling method described in this invention, at least one set of the second pipe and the second scaling component are provided.

[0011] As a preferred embodiment of the comparative simulation test device for the geothermal fluid anti-scaling method described in this invention, the chamber is provided with a partition, which divides the chamber into a flow area and an observation area.

[0012] The power unit is located inside the flow area, and the flow diversion unit and the scaling unit are located inside the observation area.

[0013] A third scaling component is provided inside the flow area, and the third scaling component is located in a relatively stationary area at the water inlet of the power unit.

[0014] As a preferred embodiment of the comparative simulation test device for the geothermal fluid anti-scaling method described in this invention, a flow controller is connected to both the first pipe and the second pipe.

[0015] As a preferred embodiment of the comparative simulation test device for the geothermal fluid anti-scaling method described in this invention, an electric heater and a temperature probe are provided inside the flow area, and at least one set of the electric heater is provided.

[0016] Each of the electric heaters is connected to the housing via a first bracket.

[0017] The observation area is equipped with a cooling water jacket.

[0018] As a preferred embodiment of the comparative simulation test device for the geothermal fluid anti-scaling method described in this invention, it further includes a return water unit connected to the power unit.

[0019] The water return unit includes a water distributor located inside the observation area. The water inlet of the water distributor is connected to the water outlet of the power unit. The water outlet of the water distributor is connected to the first pipe and the second pipe respectively. The ends of the first pipe and the second pipe away from the water distributor are both connected to a water return pipe. Multiple water return pipes are connected to tail pipes by clamps. The ends of multiple tail pipes away from the water return pipes all penetrate the partition and enter the flow area.

[0020] The cooling water jacket is fitted onto the water distributor.

[0021] A tee fitting is connected to the return water pipe, and a ball valve is connected to the tee fitting.

[0022] The geothermal fluid anti-scaling method of the present invention has the following advantages compared with the simulation test device: The power unit extracts the geothermal fluid from the tank and transports it to the first and second pipes. The geothermal fluid in the first pipe passes directly through the first scaling component, and the fluid in the second pipe is treated by the scale inhibition device to be tested before passing through the second scaling component. After running for a period of time, the amount of scaling on the first scaling component on the first pipe without the scale inhibition device to be tested is compared with the amount of scaling on the second scaling component on the second pipe with the scale inhibition device to be tested. The scale inhibition performance of the scale inhibition device to be tested is judged. This solves the embarrassing situation that existing scale inhibition products cannot provide test data and only visually display equipment pictures. It can also conduct multi-specimen tests on different geothermal fluids or fluids of different concentrations to obtain scale analysis data of geothermal fluids of different concentrations.

[0023] Given the urgent need in the existing technology for a comparative simulation test device for geothermal fluid scale prevention methods, to identify various scale inhibition methods and devices, to continuously improve the scale inhibition effect, and to provide testing services for manufacturers to find the performance parameters of the best ratio data, another objective of this invention is to provide a comparative simulation test method for geothermal fluid scale prevention methods.

[0024] To achieve the above objectives, the present invention adopts the following technical solution: a comparative simulation test method for geothermal fluid scale prevention, comprising the following steps: Provide at least one first pipe and at least one second pipe, and install the scale inhibitor to be tested on the second pipe.

[0025] The fluids entering the first and second pipes are controlled to have consistent flow conditions. The geothermal fluid inside the box is extracted and transported to the first and second pipes by the power unit.

[0026] The geothermal fluid inside the first pipe passes directly through the first scaling component, while the fluid inside the second pipe is treated by the scale inhibition device to be tested before passing through the second scaling component.

[0027] After a predetermined period of testing, the amount of scale on the first and second scale-forming components is obtained and compared to evaluate the scale inhibition performance of the scale inhibition device under test.

[0028] As a preferred embodiment of the comparative simulation test method for the geothermal fluid anti-scaling method described in this invention, the consistent flow conditions include at least consistent flow rate and consistent fluid temperature.

[0029] As a preferred embodiment of the comparative simulation test method for the geothermal fluid anti-scaling method described in this invention, wherein: before the test, Na is detected... + K + Mg 2+ Ion concentration, controlling Na + K + Mg 2+ The concentrations of Na are not higher than 0.08 mol / L, 0.04 mol / L, or 0.08 mol / L, respectively. + K + Mg 2+ If any ion exceeds the limit, dilute its concentration.

[0030] As a preferred embodiment of the comparative simulation test method for the geothermal fluid anti-scaling method described in this invention, mineral ions are added to the geothermal fluid after a period of reaction.

[0031] The added mineral ions include Ca. 2+ SO4 2- and HCO3 - .

[0032] The beneficial effects of the geothermal fluid anti-scaling method of the present invention compared with the simulation test method are the same as those of the geothermal fluid anti-scaling method comparison simulation test device, and will not be repeated here. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention.

[0035] Figure 2 This is a schematic diagram of Embodiment 2 of the present invention.

[0036] Figure 3 This is a schematic diagram of the front structure of the present invention.

[0037] Figure 4 This is a schematic diagram showing the connection between the power unit and the return water unit of the present invention.

[0038] Figure 5 This is a schematic diagram of the water return unit structure of the present invention.

[0039] Figure 6 Ca at different reaction times in this invention 2+ Concentration diagram.

[0040] Figure 7 This invention relates to Ca under different ion concentrations. 2+ Concentration diagram.

[0041] Figure 8 Ca at different reaction times in this invention 2+ Schematic diagram of concentration changes.

[0042] Figure 9 This invention is C0 / C t (b) Schematic diagram of the change (Note: C0 is Ca) 2+ Initial concentration, mg·L -1 C t For Ca 2+ The concentration at time t, mg·L -1 ). Detailed Implementation

[0043] To make the objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0045] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0046] Example 1

[0047] Reference Figure 1 This embodiment provides a comparative simulation test device for geothermal fluid anti-scaling methods, including: a power unit 100, which is disposed inside a housing 200. The power unit 100 is used to extract geothermal fluid and transport it to a diversion unit 300. The diversion unit 300, which is connected to the power unit 100, diverts the geothermal fluid transported by the power unit 100 to a first pipe 301 and a second pipe 302. A scaling unit 400 includes a first scaling component 401 and a second scaling component 402. The first scaling component 401 is connected to the first pipe 301, and the second scaling component 402 is connected to the second pipe 302 through a scale inhibition device 403 to be tested.

[0048] The power unit 100 extracts the geothermal fluid from inside the housing 200 and delivers it to the first pipe 301 and the second pipe 302. The geothermal fluid in the first pipe 301 passes directly through the first scaling component 401, while the fluid in the second pipe 302 is treated by the scale inhibition device 403 and then passes through the second scaling component 402. After running for a period of time, the scale buildup on the first scaling component 401 on the first pipe 301 without the scale inhibition device 403 is compared with that on the second scaling component 402 on the second pipe 302 with the scale inhibition device 403 installed. This allows for the determination of the scale inhibition performance of the scale inhibition device 403, thus addressing the limitation of existing scale inhibition products that cannot provide test data and only display equipment images. Furthermore, it enables multi-sample tests on different geothermal fluids or fluids of different concentrations to obtain the effect of the scale inhibition device 403 under different concentrations of geothermal fluid.

[0049] The power unit 100 can be a centrifugal pump, submersible pump, self-priming pump, reciprocating pump, vortex pump, jet pump, etc., as long as it can pump water.

[0050] The first scaling component 401, the second scaling component 402, and the third scaling component 202 can all be: scale inhibitor coating test pieces, multi-element alloy test pieces, or glass test pieces, etc.

[0051] Both the first pipe 301 and the second pipe 302 are transparent glass pipes, allowing for observation of the scaling condition of the first scaling component 401 and the second scaling component 402 at any time during the test, and control of the test duration to achieve the ideal test and detection state.

[0052] Among them, the scale inhibition device 403 to be tested is a very mature existing technology, which can be coating technology, magnetic field scale inhibition technology, electric field scale inhibition technology, multi-element alloy scale inhibition technology and ultrasonic scale inhibition technology. In practical applications, which combination method is more effective and more cost-effective requires quantitative analysis and comparison of the device of the present invention.

[0053] Example 2

[0054] Reference Figure 2At least one set of the second pipe 302 and the second scaling component 402 is set. The performance of the scale inhibition device 403 to be tested can be determined by one set of the second pipe 302 and the second scaling component 402. After one set is tested, another scale inhibition device 403 to be tested is tested. However, it usually takes several hours to test one by one, which is inefficient. By setting multiple second pipes 302 and installing the second scaling component 402 at the same time, and installing one scale inhibition device 403 to be tested on each second pipe 302, that is, testing multiple scale inhibition devices 403 to be tested at the same time, the performance of multiple scale inhibition devices 403 to be tested can be compared at the same time after running for a period of time. This is more efficient and solves the embarrassing situation that existing scale inhibition products cannot provide test data and only visually display equipment pictures. It can also conduct multi-specimen tests for different geothermal fluids or fluids of different concentrations to obtain scale analysis data of geothermal fluids of different concentrations.

[0055] Furthermore, a frame is welded inside the chamber 200, forming a sealed box with the chamber 200 and the frame. The interior can store geothermal fluid for testing. The surface of the chamber 200 has an outer protective plate, and an insulation layer is set between the chamber 200 and the outer protective plate. The insulation layer serves to provide heat insulation and protection. A support block is welded to the bottom of the chamber 200, and the outer protective plate is fixedly connected to the support block to form a whole. There is a flow gap at the bottom of the chamber 200, and a drain pipe is welded at the flow gap. The end of the drain pipe has a removable plug or valve, which facilitates the discharge of fluid from the chamber 200 when it is necessary to replace the fluid or drain the fluid for maintenance. The insulation on the top of the chamber 200 is relatively thin and can be disassembled. During the test, the upper insulation layer can be lifted at any time to observe the scaling of the first scaling component 401 and the second scaling component 402.

[0056] Reference Figure 3 The housing 200 is equipped with a partition 201, which divides the housing 200 into a flow area S and an observation area N. The power unit 100 is located inside the flow area S, and the diversion unit 300 and the scaling unit 400 are located inside the observation area N. A third scaling component 202 is provided inside the flow area S. The third scaling component 202 is located in a relatively static area at the inlet of the power unit 100. The third scaling component 202 is the same as the first scaling component 401 and the second scaling component 402. The third scaling component 202 is used to detect the scaling situation inside the housing 200 when it is relatively static, and compare it with the first scaling component 401 and the second scaling component 402 to further increase the accuracy of the detection.

[0057] Furthermore, the partition 201 includes an upper panel 201a and a lower panel 201b horizontally arranged inside the housing 200. The upper panel 201a and the lower panel 201b are arranged in parallel and connected by a load-bearing channel steel 201c. The upper panel 201a and the lower panel 201b are bolted to the top and bottom of the load-bearing channel steel 201c, respectively. The load-bearing channel steel 201c is welded to the frame. An insulation layer is also provided between the upper panel 201a and the lower panel 201b. The upper panel 201a, the lower panel 201b, and the load-bearing channel steel 201c form a platform. The upper panel 201a and the top of the housing 200 form an observation area N. The first pipe 301 and the second pipe 302 are both located inside the observation area N. The lower panel 201b and the bottom of the housing 200 form a flow area S.

[0058] The power unit 100 includes a complete set of components such as a submersible pump, motor, coupling, outlet pipe, and mounting platform. The liquid level of the submersible pump can be customized according to the height of the platform (i.e., the platform formed by the upper panel 201a, lower panel 201b, and load-bearing channel steel 201c), and the outlet direction and outlet center height can be adjusted to facilitate platform installation. The pump body specifications and models should also be selected according to the design flow rate, resistance calculation, and operating temperature of the test device.

[0059] During the experiment, the geothermal fluid in the chamber 200 is in dynamic flow. This flow is non-uniform. The fluid inside the chamber 200 gradually concentrates at the suction port at the bottom of the power unit 100, and the flow rate gradually increases. In one corner of the chamber 200, there is a relatively static area that slowly spirals. In this relatively static area, a third scaling component 202 with the same area and shape as the first scaling component 401 and the second scaling component 402 is placed. If necessary, a baffle is added to further limit the disturbance of the third scaling component 202. Scaling analysis and comparison under dynamic and static conditions are carried out under the same temperature, liquid concentration, and test time.

[0060] The rest of the structure is the same as in Example 1.

[0061] Example 3

[0062] Reference Figures 3-5 Both the first pipe 301 and the second pipe 302 are connected to a flow controller 301a. The flow controller 301a adopts an orifice plate adjustment method and is adjusted according to the design test conditions to ensure that the flow rates of the first pipe 301 and the second pipe 302 are the same, and to ensure that the dynamic test conditions of the first scaling component 401 and the second scaling component 402 are consistent.

[0063] Furthermore, an electric heater 203 and a temperature probe 204 are installed inside the flow area S. At least one set of electric heaters 203 is provided, and each electric heater 203 is connected to the housing 200 through a first bracket 203a. A cooling water jacket 205 is provided in the observation area N. For structural reasons, the first bracket 203a is used to support the electric heaters 203 and reduce the stress on the sealing port at the connection between the electric heaters 203 and the housing 200. It is best to set multiple electric heaters 203 so that the heating is more uniform. At the same time, multiple electric heaters 203 can heat and control simultaneously. The control is realized by the power regulator in the controller. The number can be adjusted appropriately according to the situation later. The cooling water jacket 205 is connected to external cooling water. In order to simulate the actual working conditions of high-temperature operation of the equipment, the geothermal fluid needs to be heated during the test and its test temperature needs to be maintained. When necessary, an extreme cold temperature change test will also be conducted on the geothermal fluid to further observe the scaling. Therefore, the equipment needs to have heating, heat preservation and cooling functions.

[0064] Multiple temperature probes 204 can be installed, with some temperature probes 204 corresponding to the positions of multiple electric heaters 203. One temperature probe 204 is located at the water inlet of the power unit 100, and another temperature probe 204 is located at the connection between the water distributor 501 and the power unit 100. Multiple temperature probes 204 are used to monitor the fluid temperature in real time. When an extreme cold temperature change test is required, a temperature probe 204 also needs to be installed on each return water pipe 502.

[0065] Furthermore, multiple turbulence plates 206 are installed inside the housing 200. These turbulence plates 206 are arranged alternately, and the number of turbulence plates 206 is a multiple of four, i.e., 4, 8, 12...4X. This arrangement is to cause the heated, circulating geothermal fluid to form an S-shaped flow, creating turbulence and allowing the fluid temperature to become more uniform. Considering the layout of the equipment inside the housing 200, a minimum of 4 plates is normally acceptable, but it can also be increased to 8 or 12. The more plates there are, the better the uniformity of fluid density. Lateral turbulence plates 206 can also be added.

[0066] Furthermore, it also includes a return water unit 500 connected to the power unit 100. The return water unit 500 includes a water distributor 501 located inside the observation area N. The inlet of the water distributor 501 is connected to the outlet of the power unit 100, and the outlet of the water distributor 501 is connected to the first pipe 301 and the second pipe 302 respectively. The ends of the first pipe 301 and the second pipe 302 away from the water distributor 501 are both connected to a return water pipe 502. After the test, the return water pipe 502 is connected to the first pipe 301. The connection between pipe 1 and pipe 302 is disconnected, and the first scaling component 401 and the second scaling component 402 inside the first pipe 301 and pipe 302 can be removed. The return water pipe 502 is connected to the upper panel 201a through a sliding bracket. Multiple return water pipes 502 are connected to tail pipes 504 through clamps 503. The ends of multiple tail pipes 504 away from the return water pipes 502 all penetrate the partition 201 and enter the flow area S. The cooling water jacket 205 is fitted on the water distributor 501.

[0067] The return water pipe 502 and the tail pipe 504 are connected by a clamp 503, which allows the tail pipe 504 to be removed and replaced with a measuring cylinder or other measuring device to determine whether the flow rates of multiple branches are the same.

[0068] Furthermore, the platform around the tailpipe 504 (i.e., the platform formed by the upper panel 201a, the lower panel 201b, and the load-bearing channel steel 201c) needs to be designed to be detachable in actual application. Due to the installation structure of the upper panel 201a and the lower panel 201b, it is not easy to disassemble. In order to observe the internal condition of the box 200, there needs to be a detachable part to observe the internal condition. For example, before the test, when installing and maintaining the electric heater 203, injecting the geothermal fluid for the test, observing the liquid level, and adjusting the flow balance of multiple branches, a certain amount of space is needed for moving the measuring cylinder and measuring.

[0069] Furthermore, a tee fitting 502a is connected to the return water pipe 502, and a ball valve 502b is connected to the tee fitting 502a. During the test, due to scaling, the mineralization content of the geothermal fluid will decrease. It is necessary to regularly analyze the changes in the flowing water quality. When the water quality changes significantly, it is necessary to adjust the water quality and increase the mineralizing agent. Therefore, the ball valve 502b can be opened to add mineralizing agent or introduce fluid through the external pipe. Considering the high temperature during the test, the elbow above the intermediate branch tail pipe 504 can be replaced with a tee fitting 502a, and an infusion ball valve 502b can be installed at the upper opening. After the infusion is completed, the ball valve 502b is closed to prevent debris from falling in.

[0070] The rest of the structure is the same as in Example 2.

[0071] Example 4

[0072] Reference Figures 1-3It also includes a controller, which is connected to the power unit 100 and the electric heater 203 via wiring. The controller consists of a PLC, data module, configuration software, power regulator, electrical switch, and internal connecting wires, etc., to provide power for high-voltage control and measurement data acquisition. Turning on the main circuit switch energizes the equipment. The configuration software establishes a logical relationship between the probe temperature and the heating output of the electric heater 203. During the test, it automatically controls the operation of the circulating pump and the heating output of the electric heater 203 to complete the test task. The test temperature setpoint is input into the PLC. The PLC collects the temperature probe 204 data through the data module, stores it in the database, and compares the probe temperature with the temperature setpoint. When the probe temperature data is lower than the set temperature value, the PLC turns on the electric heater 203 through the module and power regulator to heat the geothermal fluid. When the probe temperature approaches the set temperature, the PLC, under internal logic control, will gradually reduce the heating output of the electric heater 203 to gradually bring the geothermal fluid closer to the set temperature requirement. When the probe temperature reaches the set value, the PLC, under internal logic control, will maintain a small heating output of the electric heater 203. This heat is the heat loss of the chamber 200, keeping the temperature inside the chamber 200 constant, basically maintained within ±0.3℃. All test data are recorded in the database over time, and the data can be downloaded for further analysis when needed.

[0073] The rest of the structure is the same as in Example 3.

[0074] Example 5

[0075] Reference Figures 1-7 This embodiment provides a comparative simulation test method for preventing scale buildup in geothermal fluids, and the specific steps are as follows:

[0076] S1: Provide at least one first pipe 301 and at least one second pipe 302, and install the scale inhibitor 403 to be tested on the second pipe 302.

[0077] S2: Control the fluids entering the first pipe 301 and the second pipe 302 to have consistent flow conditions, and use the power unit 100 to extract the geothermal fluids inside the box 200 and transport them to the first pipe 301 and the second pipe 302.

[0078] S3: The geothermal fluid inside the first pipe 301 passes directly through the first scaling component 401, and the fluid inside the second pipe 302 is processed by the scale inhibition device 403 to be tested before passing through the second scaling component 402.

[0079] S4: After a predetermined time test, obtain and compare the amount of scale on the first scaling component 401 and the second scaling component 402 to evaluate the scale inhibition performance of the scale inhibition device 403 to be tested.

[0080] By designing a comparative experiment, the first pipe 301 serves as the blank control group, and the second pipe 302 serves as the test group. This approach can quantitatively eliminate the interference of environmental factors, directly quantify the actual effect of the scale inhibition device, and overcome the limitations of existing technologies that rely solely on experience or images.

[0081] Furthermore, consistent flow conditions include at least consistent flow rate and consistent fluid temperature. By using orifice plate flow meters and PID temperature control systems, the consistency of multi-channel parameters is ensured, variable errors are eliminated, and the difference in scale formation is attributed solely to the performance of the scale inhibition device, thereby improving the reliability of the test.

[0082] Reference Figure 6 and Figure 7 Before the experiment, Na was detected. + K + Mg 2+ Ion concentration, controlling Na + K + Mg 2+ The concentrations of Na are not higher than 0.08 mol / L, 0.04 mol / L, or 0.08 mol / L, respectively. + K + Mg 2+ If any ion exceeds the limit, its concentration should be diluted. This dilution can be achieved directly by adding water. After a period of reaction, mineral ions, including Ca, should be added to the geothermal fluid. 2+ and HCO3 - .

[0083] From the appendix Figure 7 It can be seen that when Na + K + Mg 2+ When the concentration exceeds the corresponding critical points of 0.08 mol / L, 0.04 mol / L, or 0.08 mol / L, when Na + K + Mg 2+ Before the critical point, due to the salt effect (i.e., electrostatic interactions between ions in the solution), as the concentration continues to increase, the increase in ion concentration will decrease the Ca2+ concentration. 2+ and HCO3 - The migration rate is reduced, inhibiting its deposition at active sites. As the concentration continues to increase, the electrostatic interaction between anions and cations is enhanced, forming multi-ion aggregates, thereby weakening the electrostatic attraction acting on CaCO3 and reducing the salt effect.

[0084] That is, below the critical point, the ions (Na+) in the solution... + K + Mg 2+ ) will surround the scale-forming ions (Ca2+ and CO3 2- Around the area, a so-called "ionic atmosphere" forms, which acts like a "shield" and reduces the concentration of Ca. 2+ and CO3 2- The effective concentration (activity) and the probability of collision between ions slow down the formation and growth of calcium carbonate crystal nuclei. The higher the ion concentration, the stronger this shielding effect and the better the scale inhibition effect.

[0085] When the concentration of ions is above the critical point, and the ion concentration is too high, the anions in the solution (such as SO42-) will... 2- ) will be with Ca 2+ Strongly binding ions form ion pairs, resulting in CaSO4. Simultaneously, the electrostatic interactions between the various ions become extremely complex, which actually increases the solubility of CaCO3 (i.e., the salt effect reverses). This means the solution's ability to "accommodate" more calcium ions without precipitation decreases. A more intuitive understanding is that too many ions crowding out the solution actually increases the solubility of CaCO3. 2+ and CO3 2- "Pushing" them together facilitated their integration and accumulation.

[0086] In layman's terms, it's Na. + K + Mg 2+ When the Na concentration is below the critical point, it provides a stable, slightly scale-inhibiting environment, clearly and accurately revealing the performance differences between different devices. This allows for fair, accurate, and repeatable comparative tests. However, when the Na concentration is above the critical point, it provides a harsh, scale-promoting environment, severely interfering with test results, degrading the performance of all devices, and potentially distorting performance rankings. This can severely underestimate high-performance devices, leading to misjudgments and even potentially selecting the wrong "optimal" device. Therefore, it is necessary to control the Na concentration. + K + Mg 2+ Only by ensuring the concentration can we guarantee that the performance differences detected are 100% due to the scale inhibitor itself rather than the harsh environment, thus increasing the accuracy of the test results.

[0087] Among them, Na + K + Mg 2+ The content can be directly detected by ion chromatography at regular intervals.

[0088] Reference Figure 8 and Figure 9 240 mg / L Ca was added to the geothermal fluid before the experiment. 2+ 732 mg / L HCO3 - Experiments were conducted at a temperature of 80°C for different reaction times. The longer the reaction time, the more calcium carbonate scale formed in the geothermal fluid. Figure 8 It can be seen that within the reaction time of 0–10 h, as time increases, Ca… 2+ The concentration showed a decreasing trend, especially after 3 hours, the rate of decrease slowed significantly, therefore, it is necessary to increase Ca. 2+ and HCO3 - .Depend on Figure 9 It can be seen that the CaCO3 scaling process follows first-order kinetics, with a crystallization rate of 0.44 h⁻¹. -1 The calculated half-crystallization time is 1.57 h. Half-crystallization time refers to the time required for the solution to form 50% crystallinity during the crystallization process. It is an important parameter reflecting the speed of calcium carbonate scaling. The smaller the value, the faster the crystallization.

[0089] Furthermore, by adding SO4 2- Ions can be used to enhance scale inhibition, or by adding HCO3. - Ions promote scaling reaction Ca 2+ + 2HCO3 - The reaction ↔CaCO3↓+ CO2↑+ H2O proceeds in the positive direction to test the performance limits of anti-scaling methods, while SO4 2- The introduction of this technology can simulate high-sulfate geothermal environments, such as the Yangbajing geothermal field in Tibet, to verify the adaptability of the scale inhibition device under sulfate-synergistic scale inhibition conditions. - The incremental addition actively exacerbates the scaling trend, challenging the limits of scale inhibition device performance, and screening out suitable high HCO3... - Fluid anti-scaling technologies, such as those used in Tianjin and Hebei, prevent failure in practical applications due to excessively mild test conditions.

[0090] If SO4 is not added 2- The test results may underestimate the actual scaling risk because SO4 2- Will with Ca 2+ The formation of CaSO4 precipitate, or competition with CaCO3 for nucleation sites, can alter scaling kinetics.

[0091] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A comparative simulation test device for geothermal fluid scale prevention methods, characterized in that: include: The power unit (100) is located inside the housing (200); The diversion unit (300) is connected to the power unit (100) and diverts the geothermal fluid transported by the power unit (100) to the first pipe (301) and the second pipe (302). The scaling unit (400) includes a first scaling component (401) and a second scaling component (402). The first scaling component (401) is connected to the first pipe (301), and the second scaling component (402) is connected to the second pipe (302) through a scale inhibition device (403) to be tested.

2. The comparative simulation test device for geothermal fluid scale prevention method as described in claim 1, characterized in that: At least one set of the second pipe (302) and the second scaling component (402) is provided.

3. The comparative simulation test device for geothermal fluid scale prevention method as described in claim 2, characterized in that: The housing (200) is provided with a partition (201) inside, which divides the housing (200) into a flow area (S) and an observation area (N); The power unit (100) is located inside the flow area (S), and the flow distribution unit (300) and the scaling unit (400) are both located inside the observation area (N); The flow area (S) is provided with a third scaling component (202), which is located in a relatively stationary area at the inlet of the power unit (100).

4. The comparative simulation test device for geothermal fluid scale prevention methods as described in any one of claims 1 to 3, characterized in that: A flow controller (301a) is connected to both the first pipe (301) and the second pipe (302).

5. The comparative simulation test device for geothermal fluid scale prevention method as described in claim 3, characterized in that: An electric heater (203) and a temperature probe (204) are provided inside the flow region (S), and at least one set of the electric heater (203) is provided; Each of the electric heaters (203) is connected to the housing (200) via a first bracket (203a); The observation area (N) is equipped with a cooling water jacket (205).

6. The comparative simulation test device for geothermal fluid scale prevention method as described in claim 5, characterized in that: It also includes a water return unit (500) connected to the power unit (100); The return water unit (500) includes a water distributor (501) located inside the observation area (N). The inlet of the water distributor (501) is connected to the outlet of the power unit (100). The outlet of the water distributor (501) is connected to the first pipe (301) and the second pipe (302) respectively. The ends of the first pipe (301) and the second pipe (302) away from the water distributor (501) are connected to return water pipes (502). Multiple return water pipes (502) are connected to tailpipes (504) by clamps (503). The ends of multiple tailpipes (504) away from the return water pipes (502) penetrate the partition (201) and enter the flow area (S). The cooling water jacket (205) is fitted onto the water distributor (501); A tee fitting (502a) is connected to the return water pipe (502), and a ball valve (502b) is connected to the tee fitting (502a).

7. A comparative simulation test method for preventing scale buildup in geothermal fluids, the specific steps of which are as follows: Provide at least one first pipe (301) and at least one second pipe (302), and install the scale inhibitor device (403) to be tested on the second pipe (302); The fluids entering the first pipe (301) and the second pipe (302) are controlled to have consistent flow conditions. The geothermal fluid inside the box (200) is extracted and transported to the first pipe (301) and the second pipe (302) by the power unit (100). The geothermal fluid inside the first pipe (301) passes directly through the first scaling component (401), and the fluid inside the second pipe (302) is processed by the scale inhibitor device (403) to be tested before passing through the second scaling component (402). After a predetermined time test, the amount of scale on the first scaling component (401) and the second scaling component (402) is obtained and compared to evaluate the scale inhibition performance of the scale inhibition device (403) to be tested.

8. The comparative simulation test method for geothermal fluid scale prevention as described in claim 7, characterized in that: The consistent flow conditions include at least consistent flow rate and consistent fluid temperature.

9. The comparative simulation test method for geothermal fluid scale prevention as described in claim 7 or 8, characterized in that: Before the experiment, Na was measured. + K + Mg 2+ Ion concentration, controlling Na + K + Mg 2+ The concentrations of Na are not higher than 0.08 mol / L, 0.04 mol / L, or 0.08 mol / L, respectively. + K + Mg 2+ If any ion exceeds the limit, dilute its concentration.

10. The comparative simulation test method for geothermal fluid scale prevention as described in claim 9, characterized in that: Mineral ions are added to the geothermal fluid after the reaction has been going on for a period of time. The added mineral ions include Ca. 2+ SO4 2- and HCO3 - .

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